Induction-coil.



/ A. PLPGHER.

INDUCTION COIL.

APPLICATION PILBD MAR.16,1912.

1,091,589. Patented Mar.31,1914

WWWWWWWW WITN ESSES r ATTORNEY .a spool 1 which for lightness of construction' J V`spool 1 a winding 3 constituting a second-h UNITED sTATEs APATENT oEEroE.

` ANDREW PLECHER, 0F LAS AIMAS, CLORADO.

INDUCTION -COIL Specification of Letters Patent.

Application led March 16, 1912. Serial No. 684,299.A

Patented Mar.31,19'14.'

To all whom it may concern.'

Be it known that I, ANDREwY-PLEGHER, a citizenof the United States, residin lat LasI Anima-s, in the county of Bent and tate of Colorado, have invented a new and useful Induction-Coil, of which the following is a\ specification. v

This invention has reference to improvements ininduction coils, and its object is to provide a coil wherein the intensity of the secondary or induced currents is increased, and, also, wherein the windings, both primary and secondary, may be connected in series or in multiple as desired, thus greatly increasing the capacity of the coil over that of an induction coil as ordinarily constructed without any increase in the size of the coil.

The invention comprises an induction coil wherein there is a plurality of bothvprimary and secondary windings with an intermediate magnetic core, while the latter when also in the form of a winding may be employed as a secondary winding.

The invention will be' best understood from a consideration of the following detailed description, taken in connection with the accompanying drawin forming a part of this specification, with t e further understanding that whilethe structure -which is diagrammatically ,represented in the drawings is capable of practical embodiment similar to the showing of the drawings, lthe invention is by no means confined to any exact conformity with the illustration of the drawings but may be variously changed and modified so long as such changes or modifications mark no material departure from the salient features of the invention.

In'the drawings: Fi ure 1 is a longitudinal diametric section t rough an induction coil embodying features of the present invention. Fig. 2 is a fragmentary longitudinal diametric section of a portion of a coil of modified construction from that shown in eferring to the drawings, there is shown ma -have an axial passage 2 therethrough, alt ough the presence or-absence of the passage has no bearing u'lpon the electrical side of the invention. T e spool 1 is usually formed of suitable insulating material.

I n the form of theA invention shown in the drawings there is first produced upon the roduced uponthe'winding 4, and', oi?` course, suitably insulated therefrom, is an annular core 5 conveniently made in the form of a winding of iron wire, although in some instances the core may be otherwise constructed. Produced upon the core 5 exterior thereto is another winding 6 like the winding 4, and upon the winding 6 is another windin 7 which may constitute a secondary winding and be similar to the winding 3, it being understood that all the windings are suitably electrically insulated bt'h as to their individual turns and as to each winding as a` whole.

Under some circumstances it may be desirableto utilize the core 5 not only' as a magnetic core, but as a' windin from which current may be obtained, an in such instancevthe winding 5may be in the form yof a winding of insulated iron' wires indicated at 5n in Fig. 2, while the other windings shown' in Fig. 2 may be the same as those of Fig. 1.

Suitable leads are, of course, provided' for all the windings andl assuming that the windings 4' and 6 are primary windings, then these two windings may be coupled up either in series or multiple with a source of electric current which may be a source of alternating current or a source of pulsating currentsuch as is produced by a suitable rheotome as is customarily provided for i11- duction coils where direct current is available. The coils 3 and 7 may be connectedu in series or multiple in accordance with the desired intensity of the current to be uti lized.

When the induction coil is used as a stepup transformer, the. windings 4 and 6 are connected up to the source lof current', and, therefore, become primary `windings with the windings 3. and 7 actin as seconda windings, and when the in uction Acoi-l .is used as a step-down transformer then the connections are' reversed.

of -the coil.

. than the single It will be understood, of course, that the several windings are properly balanced in accordance with the purpose of the induction coil andwhen the core is utilized as a winding for delivering current, then such core winding is properly balancedwith therest Since the primary windings, considering the windings 4 and 6 as such, are lodged on opposite sides of the core, these windings may be ofless radial extent primary winding inclosing a central core, and also the secondary windings arel brought closer to the core not only with relation to those turns which are ordinarily nearest the core, but with relation to the turns most remote from the core, wherefore there' is amarked increase in the magneticefl'ect upon the secondary windings over and above the effect produced upon the secondary winding of an induction coil having but a single primary winding about a core, and a single secondary winding eX- terior to the primary winding.

The several windings may follow the usual practiceas regards the gage of the wire employed, the primaryvand secondary windings being customarily made fof copper wire and the core is made of soft iron wire, the specific resistance of which is, of course, higher than that of copper, and when this core is used as a secondary winding a suitable amount of wire is employed not only for the magnetic effect, but to balance withv the other secondary windings. The core even though in the form of a winding is the same in effeet as the usual bundle. of soft iron wires or the laminated cores employed in ordinary induction coils and produces on each primary y the full magnetic effect. Also when the core is employed as a secondary winding it not only receives tion. eiiectfrom the primary windings, but reacts magnetically upon the primary windings,

It is customary to wind induction coils circular in cross section, but this does not preclude the winding o the coil of the present invention in other forms, although ordinarily the 'circular or cylindrical form is the more easily produced, and forthis reason alone is usually preferred.

What is claimed is 1. vAn induction coil comprising a core or support of non-magnetic material, a secondary winding produced thereupon, aprimary winding on the secondary winding, a layer of magnetic material upon the (primary winding, another rimary win ing upon the magnetic materia winding u on the second-named primary winding, t e said secondary windings-conthe full induc-v thereon comprising and a secondary stituting the inner. and outer windings of the coil.

2. An induction coil comprising a tubular member of magnetic material, a primary winding producedboth outside and inside said tubular member in concentric relation and adjacent thereto, and a secondary winding produced both inside and outside the primary winding with respect to and concentric with the tubular member, said second windings constituting the inner and outer windings of the coil.

3. An induction coil composed of a plurality of both primary and secondary windings arranged with two primary windings adjacent to each other and two secondary windings separated from each other by the primary windings and constituting the first and last windingsV of the coil, andy a core of magnetic material interposed between the primary windings and constituting the sole magnetic vmaterial of the core.

4. An induction coil composed of two primary windings adjacent to each other and two secondary windings separated from each other by the primary windings,and a core of magnetic material interposed between the primary windings and constituting the sole magnetic material of the core, said magnetic material being in the form of a coil kof iron wire'constituting a secondary windin inductive relation to the primary winding a-nd the secondary windings constituting the lirst and last windings of the coil.

5. An induction coil comprising a cylindrical core of magnetic material, a primary winding on opposite sides of the core, and a secondary winding on opposite sides of the primary winding and remote from the core, these parts of the secondary winding on opposite sides of the primary winding being balanced as to resistance.

6. An induction coil comprising a nonmagnetic insulating support and windings a secondary winding, a primary winding, a magnetic core, a primary winding and a secondary winding in the order and solely to the extent named.

`7. An induction coil comprising -a secondary winding, a primary winding, a niagnetic member, a primary winding, and a secondary winding in the order named and constitutin the sole electrical and magnetic elements o v the coil,

In testimony that I claim the foregoing as myown, I have' hereto ailixed my signature inthe presence of two witnesses.

ANDREW PLECHER. Witnesses:

MnnsHALL Frrswonrn, S. WHrrALL WoRrmNc'roN, 

